Firstly, take a cooking pot, into it add tomatoes, salt, red chilli powder, turmeric powder, garlic cloves, add 2-3 cups of water and cook till the tomatoes get soft.
Allow it to cool, mash the cooked tomatoes.
Once the tomatoes are mashed well, strain the pulp out of it.
Now to the tomato pulp, add tamarind extracted pulp, little water, a pinch of red chilli powder, salt, coriander seeds powder, cumin seeds powder, black pepper corn powder, a pinch of sugar.
Bring the whole mixture to a boil.
Meanwhile for the tempering, in a tadka pan add oil and heat it.
Add mustard seeds, cumin seeds and let it splutter.
Add garlic cloves. Add chopped onions and saute for a minute.
Add dried red chillies, curry leaves and stir well.
Add the tempering to the boiled rasam.
Garnish it with chopped coriander leaves.
Serve with rice and fries or paapad!!!